Elastic recovery induced strengthening effect in copper/ multilayer-graphene interface regions revealed by instrumental nanoindentation

To distinguish the strengthening effect of multilayer graphene (MLG) on copper matrix from intrinsic grain boundary (GB), nanoindentation behavior in Cu/MLG interface (IB) region is investigated and further compared with those GB pure interior (GI) regions. The indentation displacement recovery ratio, elastic work hardness IB regions are significantly enhanced as GI can be attributed to during unloading period induced by MLG, which confirmed both experimental simulated topography evolutions. In addition, gradient revealed gradual increase decreasing distance MLG findings this paper utilized precisely enhance mechanical performance composite materials tailoring interfacial microstructure property.